It looks you don't have enough information. There are two medical tests. The first is arranged by the company which wants to hire to ensure desired medical fitness for the job. The other test is required by government to see if there is some contagious disease (like TB, HIV, hepatitis etc) at the time of issuance of work permit and renewal of visa. Hope it clears. My question is about medical test required by the company (X, Y, Z....).